Seismic Emission Tomography (SET): numerical modeling study
Abstract
Seismic Emission Tomography (SET) provides a robust and sensitive tool for spatial localization of weak micro-seismic events, and is especially useful when signal levels are not sufficient for conventional time domain analysis. Spatial resolution in SET images depends on the signal duration and the geometry of the recording network. Spatial resolution becomes an issue when the travel time from the source to the receiver is comparable with the duration of the signal. Furthermore, the event location accuracy depends on the accuracy of the seismic velocity model in the region of interest. Synthetic simulation studies have helped us to understand the sources of error and their effect on SET ability to resolve discrete micro-seismic events, and allow us to determine the sources of signal artifacts and possibly even eliminate them. In this simulation study we addressed several issues relevant to practical SET: * Sensitivity of SET as compared with sensitivity of seismic techniques based on arrival time. * Spatial semblance behavior at the depths which exceed aperture of array (linear spread of geophones). * Effect of the multiple signals within the same semblance time interval. * Effect of the incorrect positioning of the semblance time window. * Effect of the usage of an inaccurate seismic velocity model. * Effect of the duration of seismic signal on the accuracy of microseismic event location.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFM.S33A2072S
- Keywords:
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- 7299 SEISMOLOGY / General or miscellaneous